Travel with friends or family members when possible and never go anywhere with a stranger.

尽可能和朋友或家人一起旅行，不要和陌生人一起去任何地方。

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We can even walk to work when possible, because it is really helpful for both of our budget and health.

如果可能的话，我们甚至可以步行去上班，因为这对我们的预算和健康都很有帮助。

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523 students cleaned their teeth within ten minutes of eating when possible they used a toothbrush, when this was impossible they washed their mouth thoroughly with water.

523名学生在吃饭后十分钟内刷牙。如果情况允许的话，他们会使用牙刷；否则，他们会用水彻底清洗口腔。

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The European Union, Canada and the World Food Program buy locally when possible.

VOA: standard.2010.04.29

The ones who would conserve energy, that is they were sedentary when possible, other then when they had to go get food would again not waste their calories but would save them and contribute to the gene pool.

那些保存能量的人,那些能躺不坐,能坐不站的人,除非必须再次寻找食物,否则是绝对不会浪费能量的人,也是对基因库有贡献的

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

So that's a big help. And equilibrium happens when there isn't any possible change of state that would satisfy this.

这个非常方便，当所有的变化,都无法满足这个公式的时候,系统就达到了平衡。

麻省理工公开课 - 热力学与动力学课程节选

Tour hours will be extended when possible based on the official White House schedule.

WHITEHOUSE: Our Top Stories

When possible, Boston financiers back entrepreneurs who have worked at other firms in their portfolios.

FORBES: Cool Heads

Serve fruits and vegetables at every meal, eaten family-style when possible and no fried foods.

WHITEHOUSE: Our Top Stories